Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Na rodada 4, qual é a Nacionalidade de Byun Hye-young?
 ###Tabelas: CREATE TABLE heats (heats_id AUTO_INCREMENT PRIMARY KEY, Heat INT, Lane INT, Name VARCHAR, Nationality VARCHAR, Time VARCHAR) CREATE TABLE record_vs._other_opponents_at_least_15_games_played (record_vs._other_opponents_at_least_15_games_played_id AUTO_INCREMENT PRIMARY KEY, Missouri vs. VARCHAR, Overall Record VARCHAR, at Columbia VARCHAR, at Opponents Venue VARCHAR, at Neutral Site VARCHAR, Last 5 Meetings VARCHAR, Last 10 Meetings VARCHAR, Current Streak VARCHAR) CREATE TABLE most_wickets_in_the_tournament (most_wickets_in_the_tournament_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Overs VARCHAR, Runs VARCHAR, Wkts VARCHAR, Mdns VARCHAR, Econ VARCHAR) CREATE TABLE 1996_squad_statistics (1996_squad_statistics_id AUTO_INCREMENT PRIMARY KEY, Player VARCHAR, Position VARCHAR, Tries INT, Goals INT, Points INT) CREATE TABLE fresh_water_withdrawal_by_country (fresh_water_withdrawal_by_country_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Total Freshwater Withdrawal (km 3 /yr) VARCHAR, Per Capita Withdrawal (m 3 /p/yr) INT, Domestic Use (m 3 /p/yr)(in %) VARCHAR, Industrial Use (m 3 /p/yr)(in %) VARCHAR, Agricultural Use (m 3 /p/yr)(in %) VARCHAR)  
SELECT Nationality FROM heats WHERE Heat = 4 AND Name = byun hye-young